Preheat oven to 350 degrees. Spray small bar pan with nonstick cooking spray. Combine sugar, melted butter, egg and vanilla in bowl, mix well.
Combine flour, cocoa powder and salt in sm bowl. Add to other mixture; whisk until smooth. Stir 1/4 cup each of the chocolate morsels and walnuts into batter. Spread batter evenly in pan. Bake 18-20 mins or until brownie is set in center. Cool.
Immediately sprinkle remaining chocolate morsels over hot brownie. Let chocolate stand until softened; spread evenly. Sprinkle with remaining nuts.
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